Extract Text From a Scanned PDF With OCR
Use OCR only when the page is pixels rather than selectable text.
Start with the real problem
Do not optimize the format blindly. First identify whether the source is native text, a scan, a photo, or a mixture. That determines which transformation can save space or recover structure without destroying useful information.
Technical detail worth knowing
If Ctrl/Cmd+A cannot select meaningful page text, the PDF may be image-only—but selection alone is not a perfect diagnostic because some PDFs have broken encodings or hidden text layers.
Keep the original. Make one deliberate transformation, inspect the derivative, and only then decide whether another step is justified. Repeated lossy conversions compound artifacts and make diagnosis harder.
A controlled workflow
- Do not optimize the format blindly. First identify whether the source is native text, a scan, a photo, or a mixture. That determines which transformation can save space or recover structure without destroying useful information.
- Keep the original. Make one deliberate transformation, inspect the derivative, and only then decide whether another step is justified. Repeated lossy conversions compound artifacts and make diagnosis harder.
- Check the output at the size and in the application where it will actually be used. Verify small text, page order, selectable text when expected, tables, dates, identifiers, and the final file size or destination requirement.
Common failure modes
- Re-running the same conversion without changing the input problem.
- Judging quality only from a thumbnail preview.
- Deleting the source before the derivative has passed its acceptance check.
Acceptance test
Check the output at the size and in the application where it will actually be used. Verify small text, page order, selectable text when expected, tables, dates, identifiers, and the final file size or destination requirement.
Where FilexFlow fits
FilexFlow can perform the conversion step, but it cannot guarantee that OCR inferred every character correctly or that a third-party portal will accept a file. Treat the result as a derivative that still needs a human acceptance check.
Use OCR only when the page is pixels rather than selectable text.
Related guides and tools
Technical source
https://tesseract-ocr.github.io/tessdoc/ImproveQuality.html
Last reviewed: 2026-09-15

